booting automatically again

[kumarn_2004]

*It relates to Windows XP Home Edition(SP3). When I switch on my system,it boots and it comes to Desktop screen and from that Desktop screen it boots again in a very few seconds automatically and scan-disk does automatically and comes the desktop screen lastly without any further problem . How to correct this problem?

I want to install the missing operating files only on my system by inserting my original operating software CD. How to do that (in step-by-step procedure)?

[Amir.php]

Easiest way for you:
Insert xp sp3 cd in your cd drive> install screen will open> choose install> choose upgrade(recommended) option.
Now follow step by step instruction.